cmd/mbf: proof-of-concept CI servicedevelop

This accepts CI work over a shared read-only cache directory. This
replaces the nix CI service and prepares the removal of nix from the
test infrastructure.

Signed-off-by: Ophestra <cat@gensokyo.uk>

1 files changed, 3 insertions, 0 deletions

diff --git a/pkg/pkg.go b/pkg/pkg.go
index e3d32028..c2fe42fe 100644
--- a/pkg/pkg.go
+++ b/pkg/pkg.go
@@ -2933,6 +2933,9 @@ func Open(
 	return &c, nil
 }
 
+// Path returns the pathname of the directory holding [Cache] state.
+func (c *Cache) Path() *check.Absolute { return c.base }
+
 // Collected is returned by [Collect.Cure] to indicate a successful collection.
 type Collected struct{}